Who is that boy _____ in the pool?

Who is that boy _____ in the pool? that, the, tree, who, boy, in, is, that,the,tree,who,boy,in,is(?) Look!Who is -------------------in the the pool? The boy is swimming at the pool.为什么是at the pool?用in the pool Who is the second _____ ( heavy ) boy in your class that,the,tree,who,boy,in,is(.)连词成句 that is boy in photo .who the photo second Who's that boy _____?A.in green B.in the green C.in a green Who is that boy _____ _____?He is Li Ming. girl,in,who,the,pool,is,swimming连词成句 连词成句:girl,in,who,the,pool,is,swimming